Here's one that is comfortable (high back) and a universal fit. It appears that like a lot of things the Covid19 problems has made supplies of a lot of thing hard to get and prices to be higher than 9 months ago. OEX has several model they can get but the other are a little more money. This one I would say is the starting point of a decent seat. here is a link to their catalogue. OEX has a store in San Diego in Kearney Mesa and another up at Sunset Beach if you are closer to LA area. Through this link you can get it from their online store (kayak fishing supply) and have it shipped and save fuel. P.S. the Hobie original seats suck, they were very uncomfortable. Figured you bought Jorge's Revo. The attached picture is for the one through OEX/kayak fishing supplies.
https://www.kayakfishingsupplies.com...ite-kayak-seat
This is a similar seat but less than 1/2 the price on Ebay.
https://www.ebay.com/itm/Rage-Powers...8AAOSwS-NfBoQH